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| Japanese Explosive Ordnance – Army Ammunition – Navy Ammunition |
| Chapter 5 - Section 4 |
| NAVY PROJECTILE FUZES |
| Type 13th-Year Mk 4 and Mk 4 Mod 1 - Base Fuze |
| Use: |
| Type 13th-year Mk 4 20-cm type 91 A.P. |
| Type 13th-year Mk 4 Mod 1 36-cm A.P. |
| Mk 4 | Mk 4 Mod 1 | ||
| Over-all length (with gaine) | 6 3/8 inches | 6 7/8 inches. | |
| Threaded length | 1 19/64 inches | 1 7/16 inches. | |
| Number of threads | 13 | 13. |
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Construction: The design of these fuze is almost identical to the type 13- year Mk 1 Mod 1 fuze, differing only in size and minor body features. The gaine, however, is of dif-ferent construction than that used in the Mk 1 fuze. It contains a primer delay, relay, initiator, and booster. |
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Operation: The operation of this fuze is the same as the type 13-year Mk 1 Mod 1. |
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Figure 451 – Type 13-year Mk 4 and Mk 4 Mod 1 Base Fuze. |
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